Notebook[List[Cell[BoxData[FormBox[RowBox[List[SubscriptBox["choosesm", "i"], "=", RowBox[List[RowBox[List[RowBox[List["(", RowBox[List["i", "-", "1"]], ")"]], SubscriptBox["M", "i"]]], "-", FractionBox[RowBox[List["N", "-", SubscriptBox[OverscriptBox["M", "_"], "i"]]], "2"]]]]], TraditionalForm]], "Input"]]]